Balls are generally heavy and ungracefull and have a tendancy to pull down, knock over and smash plants - you can use them, however you'll find yourself having to rearrange them often - also remember that they will also need to be cleaned - nothing wrong with having a nice natural looking tank - but the more you put in it the more that's got to be cleaned! Also - the mister is a no - no.
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Tosha 
"Nihil facimus sed id bene facimus"
7.33.0 Ball Python (Harry and Fluffy and gang)
1.0.0 Angolan Python (Anakin Skywalker)
0.0.1 Green Tree Python (Verdi - yeah I know but my kids love the book)
0.2.0 Feline (Pippen and Pandora)
0.0.1 Desert Tortoise (Pope John Paul aka JP )
2.2.1 Fish (1,2,3,4)
0.0.2 frogs rescued from pool skimmer